Des Moines (IA)
September
Weather in Des Moines, Iowa for September 2026
Your guide to Des Moines weather in September - trends and predictions
So far, September 2026 in Des Moines shows a warmer trend than usual by 4.9 °F.
The forecast for the next days in Des Moines predicts a temperature of 23.7 °F, which is cooler than the historical average.
In general, the average temperature in Des Moines at the beginning of September is 30 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 27.3 °F by the end of September.
The climate of Des Moines in September is notably wet, with an average of 11 rainy days, and a total of 128.5 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
28°/14°
Temperatures
20 km/h
Avg max wind
63 %
Avg humidity
Des Moines Weather September
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Temperatures trend during September in Des Moines
See the weather trend as well as the moving average line
September weather in Des Moines day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /15° | 0 mm | 7 | |
| Sept. 2 | Sunny | 32° /14° | 0 mm | 8 | |
| Sept. 3 | Sunny | 31° /15° | 16.7 mm | 7 | |
| Sept. 4 | Sunny | 32° /15° | 0 mm | 7 | |
| Sept. 5 |  Thundery outbreaks possible | 32° /18° | 0.4 mm | 7 | |
| Sept. 6 | Sunny | 27° /13° | 3.2 mm | 6 | |
| Sept. 7 | Sunny | 25° /10° | 13.5 mm | 5 | |
| Sept. 8 |  Cloudy | 30° /12° | 0.7 mm | 6 | |
| Sept. 9 |  Partly cloudy | 30° /14° | 21.1 mm | 7 | |
| Sept. 10 |  Overcast | 30° /16° | 0.3 mm | 7 | |
| Sept. 11 | Sunny | 28° /15° | 0 mm | 6.5 | |
| Sept. 12 | Sunny | 30° /19° | 0.2 mm | 6.5 | |
| Sept. 13 | Overcast | 24° /16° | 4.1 mm | 3.5 | |
| Sept. 14 |  Light rain shower | 33° /15° | 67.2 mm | 6.8 | |
| Sept. 15 | Light rain shower | 26° /17° | 7.2 mm | 5 | |
| Sept. 16 | Light rain shower | 19° /15° | 13.6 mm | 4 | |
| Sept. 17 | Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 18 | Sunny | 20° /10° | 0 mm | 5 | |
| Sept. 19 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 20 | Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 21 | Sunny | 23° /14° | 0 mm | 6 | |
| Sept. 22 | Overcast | 19° /14° | 10.9 mm | 5 | |
| Sept. 23 | Sunny | 25° /15° | 0 mm | 6 | |
| Sept. 24 | Overcast | 19° /17° | 49.2 mm | 4 | |
| Sept. 25 |  Fog | 27° /12° | 0 mm | 6 | |
| Sept. 26 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 27 | Fog | 28° /12° | 0 mm | 7 | |
| Sept. 28 | Mist | 28° /12° | 0 mm | 6 | |
| Sept. 29 | Partly cloudy | 31° /15° | 0 mm | 7 | |
| Sept. 30 |  Patchy light rain with thunder | 30° /16° | 1.4 mm | 7 | |
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Important Notice
Our weather forecast for Des Moines in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Des Moines forecast closer to your planned date for the most up-to-date weather information.
Change Month
Des Moines in September - FAQ
What are the expected maximum and minimum temperatures in Des Moines during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Des Moines during September?
Significant rainfall exceeding 128.5 mm is expected in Des Moines during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Des Moines during September?
The average wind speed in Des Moines during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Des Moines
Explore the daily rainfall trends and prepare for Des Moiness September weather 💧
Typically, Des Moines has 11 rainy days in September with a total of 128.5 mm of rainfall.
UV exposure in Des Moines during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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